I think having good curricula to follow would be interesting.
I always found the International Baccalaureate interesting. It seems to be both a more rigorous (academically) and a more flexible (administratively) system than typical public schools: the main demographic I heard who were doing it did so because joining the regular system would have been difficult (because they spent a year abroad, or were travelling with their parents), but they were on average very successful in tertiary education, and they all credited the IB and its rigorous curriculum. Another advantage of the IB is that, despite its unusual structure, it has near universal global recognition, which is important because a recognized high school diploma is a formal requirement in many places.
If you were able to do something like that for distance/home schooling that would be interesting.